Because we were educated before "flavor of the month" JavaScript framework...
And because if that we can appreciate elegant and practical tools and ideas. See also emacs and vim.
But it has survived - Clojure, a JVM lisp dialect, flourishes!
Feel part of what makes lisp fascinating is its simplicity and power leading to its place as a test bed for ideas such as continuations and Kanren, a new logic programming language.
1. It's all their feeble minds can understand. (This is the answer you were fishing for, yes?)
2. Too many MIT grads were brainwashed by SICP until MIT sensibly switched to Python in 2009. (Unfortunately they probably still secretly teach SICP somewhere.)
3. Lisp/Scheme readily implements "Maxwell's equations of software" which are believed to be important or useful for some reason.